Issue
Users are unable to access Webstation due to the system reaching its maximum number of concurrent user sessions.
Product Line
TAC Vista
Environment
TAC Vista Webstation
Cause
Webstation enforces a limit on the number of simultaneous user sessions based on the license configuration. When this threshold is reached, additional login attempts are blocked.
License Types and Limits
| License Type | Description |
|---|---|
| 0-008-8270-1 | Vista 5.1 Webstation 1 CAL – One concurrent user |
| 0-008-8271-1 | Vista 5.1 Webstation 3 CAL – Three concurrent users |
| 0-008-8272-1 | Vista 5.1 Webstation 6 CAL – Six concurrent users |
| 0-008-8273-1 | Vista 5.1 Webstation 12 CAL – Twelve concurrent users |
| 0-008-8274-1 | Vista 5.1 Webstation Unlimited – Unlimited users |
Additional Considerations
- Operating System & IIS Limits: These may impose additional restrictions not directly related to Webstation licensing.
- Windows XP: Limited to 10 connections due to TCPIP.SYS, resulting in error 403.9 – Access Forbidden: Too many users.
- Windows 7 (SP2): Connections beyond the limit are queued, causing delays but no error messages.
- Windows Server Editions: No connection limits – recommended for hosting Webstation.
Note: Each Webstation session uses 1 connection. Each open TGML page also uses 1 connection. For example, 1 Webstation + 5 TGML pages = 6 connections.
Resolution
Recommended OS Configurations
| OS Version | IIS Version | Connection Limit | Notes |
|---|---|---|---|
| Windows Server 2008 R2 | IIS 7.5 | No Limits | Recommended |
| Windows 7 (Ultimate/Enterprise/Business) | IIS 7.5 | 10 | Allows multiple sites |
| Windows Vista (Ultimate/Enterprise/Business) | IIS 7.0 | 10 | Allows multiple sites |
| Windows XP Professional | IIS 5.1 | 10 | Only one site |
| Windows 2000 Professional | IIS 5.0 | 10 | Only one site |
| Windows NT 4 Workstation | IIS 4.0 | No IIS | PWS installs via NT Option Pack |
Best Practices
- Use Windows Server OS for production environments to avoid connection limits.
- Monitor TGML usage to optimize connection consumption.
- Consider upgrading license if user demand exceeds current CAL limits.
